Self sealing bag is a frequently used tool in daily life, and the daily consumption is also very amazing. It is precisely because of the huge consumption every day that many self sealing bags that can still be used are discarded. Part of the reason is that the price of self sealing bags is relatively cheap, and no one will care.

自封袋聚氨酯熱彈性體有較高的撕裂強度，通?？蛇_天然橡膠10倍。但耐高溫性能鉸差，作環境溫度高于能就有所下降。電性能方面，由于聚氨酪熱彈性體具有一定的親水特性能，吸收空氣小的水分而位絕緣性下降．在高絕緣場合中使用受到限制熱塑性彈性體除亡述外二烯之類。在大多數情況下，成注塑的制的原材料都用全新料。但對于一些使用要求不高的制品，人們往往來用再生原料進行注塑生產。這一方面可以降低成本；另一方面可以實現塑料材料的循環利用。

Self sealing polyurethane thermal elastomer has high tear strength, usually up to 10 times that of natural rubber. However, the high temperature resistance is poor, and it will decrease when the ambient temperature is higher than the energy. In terms of electrical properties, polyurethane thermoelastomers have certain hydrophilic properties, absorb small moisture in the air and reduce the positional insulation. The use of thermoplastic elastomers in high insulation occasions is limited, except for dienes. In most cases, the raw materials for injection molding are brand new materials. However, for some products with low requirements, people often use recycled raw materials for injection molding production. On the one hand, it can reduce the cost; On the other hand, it can realize the recycling of plastic materials.

有利于環境保護。大多數熱理性塑料制品都是可以回收利用的，如通常，用于注塑制品的回料都是一些比較干凈、老化程度水嚴重的塑料。其主要來源有兩個方面。塑料生產廠生產過程中產生的邊角料、廢次品等，填料的大小和表面形狀對塑料性能竹一定的影響，球狀、立方體狀的通?？商岣叱晒覮性能，但機械強度差；16鱗片狀的則相反，粒子越細，對聚合物的剛性、沖擊性、拉仲強度和外觀等改進作用越大。加入填料可能導致聚合物某些性能下降，如粉狀填料常使塑料的拉伸強度、撕裂強度和耐低溫性下降。

Conducive to environmental protection. Most thermorational plastic products can be recycled. For example, the recycled materials used for injection molding products are clean and seriously aged plastics. There are two main sources. The size and surface shape of fillers, such as leftover materials, waste and defective products produced in the production process of plastic factories, have a certain impact on the plastic properties. Spherical and cubic ones can usually improve the performance of successful l addition, but the mechanical strength is poor; On the contrary, the finer the particles, the greater the improvement on the rigidity, impact, tensile strength and appearance of the polymer. The addition of fillers may lead to the decline of some properties of polymers. For example, powdered fillers often reduce the tensile strength, tear strength and low temperature resistance of plastics.

大量加入時使成型加上性能和表面光澤下降，故應當合理地選用品種、規格和加入量。在選擇填料時，要求填料具有以下幾點性能：在樹脂中分散性好、填充量大；不降低樹脂的加丁性能及制品的物理件能的改性效果；本身應具備耐水性、耐熱性、耐化學腐蝕件；個影響其他助劑的分散件和什能；對增塑劑的吸收量小，無曲折白化現象。

Large amount of addition will reduce the molding performance and surface gloss, so the variety, specification and addition amount should be selected reasonably. When selecting the filler, the filler is required to have the following properties: good dispersion in the resin and large filling amount; It does not reduce the addition performance of the resin and the modification effect of the physical part energy of the product; It shall have water resistance, heat resistance and chemical corrosion resistance; Dispersions and energy that affect other additives; The absorption of plasticizer is small and there is no tortuous whitening phenomenon.